Abstract: The automatic and accurate estimation method for gross primary productivity of a forest ecosystem based on a remote sensing technology includes: the real-time position signals of a remote sensing collection device is acquired, the forest map is acquired and the real-time position signals is displayed on the map; the meteorological parameters and forest characteristic parameters of the forest are collected by a remote sensing collection device, and the preliminary estimation on the GPP of the forest ecosystem is performed by a ground estimation model; the geomorphological features of the map are collected, it is judged whether to correct the preliminary estimation result according to the geomorphological features, and if the correction is needed, the preliminary estimation result is adjusted; and the adjusted estimation result is stored, and the dynamic fluctuation chart of the adjusted estimation result is displayed on a visual device.